John beodeick



Nrrso STATES PATENT .grrics.

OHN BRODRIOK, on NEW YORK, N. x.

PREPARED SHEET Foa STENCILS.

SPECIFICATION forming part of Letters Patent No. 377,706,.d ate dFebruary 7, 1888.

I Application filed May 20, 1886. Serial No. 202,795. lSpecimens.)

To all whom it may concern:

Be it known that I, JOHN BRODRIOK, of the city, county, and State of NewYork, have invented certain new and useful Improvements in PreparedSheets for Stencils or Transmitting Printing-Sheets, of which thefollowing is a specification, being such a full and clear description ofmy present invention as will enable others skilled in the art to whichit appertains, or with which it is most nearly connected, to employ andpractice the same in its preferred form.

The points of novelty will be designated in the claims concluding thisspecification.-

In the practice of my invention I employ a thin porous sheet of materialimpregnated or coated with a gummy or waxy substance, or

. other material impervious to ink, said sheet .being of such porosityand said gummy or waxy substance or other filling of such consistencythat when the impregnated or coated sheet is placed upon asuitablesupport or bearing-surface and impressed upon with a writing or printinginstrument, of whatever character, the gummy or waxy substance or other.material will, under the pressure thereof, be

displaced at the points or lines of impression, so as in all cases toleave them open to the passage of ink through the pores of the sheet.Such a sheet dispenses with the necessity of employing in thepreparation of stencil-sheets an abrading or puncturing instrument,bearing-surface, or plate.

It will be seen, accordingly, that my invention, considered broadly,consists of a novel stencil, or rather a transmitting printingsheet of athin material coated or filled with a substance impervious to ink, whichsheet is so porous that in the removal of the filling or coating at anypoint the sheet becomes open to the transmission of ink thereat,so thatby removing the filling or coating in the form or shape of any letter,figure, design, 850., the sheet becomes open tothe transmission of inkin the form of such letter, figure, design, 850., thereby constituting atransmitting printing-sheet. It will be observed that this sheetdiffersfrom a stencil in that the letters, figures, 8m, are not cut out. 0cannot be completely formed, for if the 0 were cut all the way aroundthe center would drop out.

In a stencil, for example, the letter ln'an application filed on evendate here with, under Serial N o. 202, 7 94, I have described andspecifically claimed another process of making a stencil-plate from thewaxed sheet herein described by the use of a heated implement. Itherefore do not claim the same here.

I prepare my improved sheet, by preference,

from a sheet of thin highly-porous paper by 6c 3 immersing the same in abath of melted gummy or'waxy substance-such as paraffine-of about 120Fahrenheit fusion-point, or by any other suitable method of waxing papernow known In paper so prepared the stylus 6 5 The stencil thus preparedis then used v The described stencil-plate for the production and multiplicationof impressions of printing is made byimpressing thetype-letters or other desired characters, designs, pictures,

maps, or illustrations upon the pre'pared' 8o sheet with type (as by atype-writing ma chine)i:or plates on which the letters, characters,designs, maps, pictures, illustrations, or engravings are made of raisedlines and surfaces, such as on being so impressed'will ex-,8 5

press from the prepared sheet the said gummy or waxy substance, leavingthe fibers thereof exposed and open to the transmission of ink. When thefilling is not adhesive, as wax to some extent is, the article is stillsubstantially o 7 the same. Stencil-plates thus prepared may then beused in duplicating impressions, as aforesaid, or otherwise. This use ofthe prepared sheet further demonstrates the distinction between it andformer prepared sheets, 5

inasmuch as the impression of the type or other character on formerprepared sheets would not produce a stencil unless some per-- foratingor abrading type or perforating or abrading bearing-surface were used.When waxed paper isv employed, as above described, and is placed upon abacking of ordinary ma terialsuch, for instance, as wood or ordinarypaper-the wax expressed from the paper by pressure will adhere to thesaid backing and be partially transferred thereto.

If there be some abrasion of the sheet in the mere act of writingthereon, it has no necessary reference to the process, for in theprocess of imprinting type, as aforesaid, there is no abrasion orperforation of the texture whatever. I use now one of the most porousand thinnest grades of paper made of the Japanese paper-tree, or Momspapyrifem satz'va, commonly known as yoshino in Japan, or as dentalpaper here, having, by preference, a weightof about seventeen ounces tothe ream of sheets, fifteen inches by ten and one-half. As far as I amaware, this is the only kind of paper or other material now in themarket or known to the public which is of sufiicient porosity, thinness,and toughness to fulfill all the necessary conditions of the abovedescribed stencil-sheet, and this paper has never before been waxed orgummed or used for stencils; but it will of course be understood thatany other sheet of material of the requisite porosity, thinness, andtoughness will be the equivalent, and may be employed in place of theabove-described sheet.

By the word stencil as applied to my invention I mean to designateherein a sheet from which the filling has been removed to prepare forduplicating the words or designs made on it, substantially as abovedescribed.

By puncturing-instrument I mean an instrumentpuncturing holes throughthe texture of the sheet by piercing it like a needle.

I am aware that stencils have heretofore been made by piercing a sheetof paper with numerous small holes, through which ink is thentransmitted;' also by abrading a sheet of waxed or varnished paper, andthereby disturbing, tearing, and lacerating the fibers or substance ofthe paper to such an extent that ink will be readily transmittedtherethrough at the lacerated or disturbed portions, the paper beingitself ,of such a character that ink will not be readily transmittedwhen the sheet is in its normal condition, and also that sheets of paperclose in texture and highly sizedsuch as bank-posthave been coated witha suitable varnish and subsequently subjected to the action ofchemicals, which open it to the transmission of ink at the points orlines of printing. My claims are therefore limited so as not to includeeither of these stencilsheets. It will be seen without furtherexplanation that these sheets and stencils are all radically diflerentfrom that herein described and claimed. Neither do I herein claim themethod or process involved in the making of my said stencil ortransmitting printing-sheets, as the same is made thesubject-matter ofan application filed by me December 2, 1887, hearing Serial No. 256,837.

The ordinary printers ink-roller may be employed, and if the firstpassage of the roller does not bring the ink through at all points ofthe lines or characters described, a few more passages in the ordinarymanner will do so.

I claim and desire to secure by Letters Patcut-- 1. A transmittingprinting sheet consisting of a thin porous sheet through which ink isreadily transmitted, such as Japanese dental paper or yoshino, filled orcoated with a substance impervious to ink, as parafiine, substantiallyas described.

2. A transmitting printing-sheet consisting ofa thin porous sheetthrough which ink is readily transmitted, such as Japanese dental paperor yoshino, filled or coated with a substance impervious to ink, asparafiinc, and

having this filling or coating removed at the.

points or lines of printing, substantially as described, for the purposespecified.

3. A prepared sheet for stencils, consisting of a sheet of Japanesedental paper or yoshino, coated with a substance impervious to ink,substantially as described.

In testimony whereof I have signed my name to this specification in thepresence oftwo subscribing witnesses.

JOHN BRODRICK.

XVitnesses:

GEORGE N. SANDERS, LoUIs A. WAGNER.

